THE-BRITISH MEDICAL .70URNAL. 821 We have, thee, to find a means or fixing the form of the heart in two R E MA R KS or more typical configurations of its cycle. In a first attempt, at least,, ON~~~~~~~~we should naturally choose for fixation the states of complete systole ON~~~~~~~~a nd complete diastole, under conditions agreeing with the normal. The THE FORM AND MECHANISM OF THE form of the heart as you see it in the post mortem room, and as it is H EAR T. seen in this specimen, cannot be regaprded as representing any one of re givinin St.~~~~~the normal configurations. The muscle may be relaxed as here, but it Nate: of a Lectur _ie nS.7ohn's College, Camb&ridge. is not distended as in natural diastole; or it may be rigid, and yet not
Dit. M1ACALISTEPR commenced his second lecture by referring to the views enunciated by Dr. Burdon Sanderson, in 1875, and pointed out that certain researches made since that date had helped to supply data then missing, and had enabled us, he said, to advance further towards a true theory of fever than was thought twelve years ago to be possible, though the "unsolved physiological problem of the normal relation of temperature to thermogenesis " is not yet fully solved. Wvre start with this : that fever of necessity implies-(1) A disorder of the thermotaxic michanisna ; (2) an excessive production of heat associated with excessive chemical changes in the tissues, the excessive production being more or less than that of a normal person on full diet (perhapq oftener less, than more),but more than that of a normal patient on fever diet; and (3) that the body temperature, depending on the state of the balance between production and discharge, fluctuates as one or the other is in the ascendant, and is not per se a true measure of eitlher, or of the consumption of tissue which may be going on. The source of licat-production. in health was the oxidation of the
Situated in the neighbourhood of Birch Tor, in the heart of the granite mass of Dartmoor, at an elevation of between 1300 and 1400 feet, there are a number of tin-mines which have been worked fitfully from remote peridods (Fig. 1). The region is wild and lonely, and has in a marked degree all the scenic peculiarities of the moorland districts of the west of England.
JULY-AUGUST, x9o8 No. 5 GEOLOGICAL ASPECT OF THE LODES OF CORNWALL.' DONALD A. MACALISTER (Assoc. R. S. M.). INTRODUCTION. Although the west of England mining region of Cornwall and Devonshire has not recently been in a flourishing condition, its past fame entitles it to a claim on the attention of those interested alike in the genesis of tin and copper ores and in the antiquity of mining. During the last few years a section of the field staff of the Geological Survey of Great Britain has been engaged in remapping the Cornish peninsula and as this work is nearly completed the most recent geological information concerning the region is available. There is quite an extensive literature dealing with the west of England geology and mineralogy, and as this has been acknowledged in the Memoirs of the Geological Survey it will be unnecessary to refer to it here? HISTORICAL. The earliest records of the connection of Cornwall with the ' Communicated by permission of the Director of the Geological Survey of England and Wales. a The Geological Survey Memoirs dealing with Cornish Mining are as follows: (x) "Geology of the Lands End District"; (2) "Geology of Camborne and Redruth "; (3) "Geology of Newquay"; (4) "Geology of Plymouth and Liskeard." Other memoirs are in course of preparation. 363 '" Tl, e Island of Ictis," ,4rchceologia, Vol. 59, 19o5. • "Ancient Britain and the Invasions of Ca•sar," I9o7.
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