Wilder.] ^4:4 [july 15^ 



Pulmnar. — plv. — Has this any distinct representative in the cat? 



Quadrans. — q. — How constant are the inequalities of the surface which 

 enable us, in some cases, to define this area ? 



Madix intermedia {rMnencephali). — JRx. in. — Is this ever, in the cat, a 

 distinct root ? 



Beptuin lucidum. — 8pt. lu. — Is there ever, except in man, any space or 

 pseudocalia, " fifth ventricle, " between its two lateral halves? Are these 

 halves ever separated by a prolongation of the pia, or only by connective 

 tissue, or are they ever actually fused so that the true nervous tissue is 

 continuous ? 



Sulcus hahence, — 81. li. — Is the line of reflection of the endyma from the 

 thalamus always along the same line, or at the same distance from the 

 habena ? 



Tos,nia. — tn. — Is the "tcunia semiculcularis " a distinct band in the cat? 

 If so, what are its relation with the rima, the proplexus and fimbria ? 



Terma. — t. — (lamina terminalis) . What is its histological composition ? 

 Shall the name be held to apply also to the very thin portion of the ce- 

 phalic wall of the aula between the prcecommissura and the crista? 



Valvula. — vv. — The roof of the longer and cephalic part of the epicoelia. 

 Does it consist of true nervous tissue, wholly, or even in part, excepting 

 at the place of attachment of the iViV". trochUares ? Is its ectal surface 

 covered by pia? What histological changes occur at its connections with 

 the cerebellum and postoptici ? 



Velum (interpositum). — vi. — What is the relation of this to the folds of 

 pia, and to the thalami and fornix ? 



D.— EXPLANATION OF THE PLATES. 



All of the preparations from which the figures are drawn are in the 

 Museum of Cornell University, and are accessible for examination to those 

 who may desire to verify the figures or the descriptions. 



In most cases, each figure is based upon more than one preparation. 

 Encephalotomists need not be reminded of the difficulty of obtaining a 

 preparation which shows many points of structure equally well. Since the 

 present paper is only general, and does not aim to indicate individual pecu- 

 liarities, or those of sex, breed, or age, most of the figures maybe regarded 

 as representing what maj'' be called an average cat' s brain. It is obvious 

 that a very large number of specimens would need to be carefully com- 

 pared in order to. confer upon any generalization respecting sex, etc., a 

 trustworthy character. 



It will be noticed that, excepting when there was some special reason 

 for a contrary course, the figures have been uniformly placed in one of 

 two positions. The symmetrical figures are so placed that the meson cor- 

 responds with that of the observer, the two sides being right and left like 

 the observer's eyes. The unsymmetrical figures, representing the lateral 

 or mesal surfaces, natural or in section, are usually so placed that the 

 cephalic end points to the left of the observer. 



