218 Dr. A. A. Rambaut. //> . rature at 



(b) On the other hand, in the cortex surrounding the area nf. 



to, old-standing optic atrophy causes no modification of the 

 lamination. 



(r) In anophthalmos the conjoined outer granule layer and line of 

 Gennari (for the granules in the former layer are not suffi- 

 ciently obvious to admit of easy micrometer measurement 

 alone) are narrowed down to two-thirds of the normal thick- 

 ness, the other layers of the cortex being approximately un- 

 changed. This amount of narrowing is the same as that found 

 in cases of old-standing optic atrophy. 



((/) The majority of the layers of the cortex either inside or outside 

 the area of special lamination do not vary appreciably in thick- 

 ness as a result of age or chronic insanity, but there is an 

 almost exact correspondence between the thickness of the con- 

 joined first and second layers cf the cortex and the degree of 

 amentia or dementia existing in the patient. 



Summary of Ctiii<-lii*i<>n* tJ mien from the present Reseur<-}t. 



(1) The area located and described in this paper is the primary 

 visual region of the cortex cerebri. 



(2) The part of this area to which afferent visual impressions 

 primarily pass is the region of the line of Gennari. 



(3) A marked contraction of the area in both extent and distribu- 

 tion, without absence of the line of Gennari, occurs in anophthalmos. 



(4) This area can probably be described as the cortical projection of 

 the corresponding halves of both retinze. In this projection the part 

 above the calcarine fissure represents the upper corresponding quadrants 

 and the part below the lower corresponding quadrants of both retinse. 



" Underground Temperature at Oxford in the Year 1899, as 

 determined by Five Platinum Resistance Thermometers." By 

 AKTHUR A. RAMBAUT, M.A., D.Sc., Radcliffe Observer. Com- 

 municated by E. H. GRIFFITHS, F.R.S. Received May 17, 

 Read June 21, 1900. 



(Abstract.) 



I. Description of the Appuratus. 



The instruments with which the earth-temperatures given in this 

 paper were observed were five platinum resistance thermometers of the 

 Callendar and Griffiths pattern. 



The thermometers were inserted in undisturl>ed gravel, the first four 



