Primary Heat Condenser This report describes conditions and costs at which quite small (100 to 1 ,O00 kilowatt) geothermal systems could be used for off-grid powering at remote locations. This is a first step in a larger process of determining locations and conditions at which markets for such systems could be developed.

Cats with large bilateral lesions limited to entorhinal cortex were impaired on the reversal but not the original learning of position habits, displayed deficient passive-avoidance behavior, were hyperactive in the open field, and were hyperphagic for some days after the surgery. The lesions had no effect on the acquisition or the punishment extinction of a one-way activeavoidance response. Control experiments showed that effects of entorhinectomy on position-habit reversals and open-field activity were not secondary to hyperphagia. The pattern of behavioral deficits suggests that the entorhinal region participates in the suppression of appetitively reinforced responses but not in the suppression of aversively reinforced responses.

An incident light microphotometer for measuring reflectance has been constructed from Wild M20 microscope components and Photovolt 520-M photometer. The instrument measures autoradiographic silver grain densities in either small regions (5-30 pm diameter) or large regions (25-150 pm diameter) with an accuracy of greater than 900b compared to visual grain counts. Grain density measurements can be made in the presence of histological stains. The device speeds the collection of autoradiographic data by a factor of 10 or more, and can be used for 6 or 7 h per day without producing significant strain on the operator.

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Issued by Sandia National Laboratories, operated for the United States Department of Energy by Sandia Corporation. NOTICE This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government, any agency thereof or any of their contractors or subcontractors. The views and opinions expressed herein do not necessarily state or reflect those of the United States Government, any agency thereof or any of their contractors or subcontractors.