288 Journal of Comparative Neurology. 



about that we cannot understand each other in the two countries, and 

 hence all scientific intercourse will become impossible." 



§209. The age of Prof. Kolliker, his magnificent services 

 in the advancement and diffusion of science, and the evident 

 sincerity of his regret at American departures from what he re- 

 gards as terminologic rectitude, all demand serious rejoinder. 



§210. Among the terms that one must " go to work to 

 learn what they mean," crista (^foniicis) designates a feature of 

 the brain which, so far as I know, was first described by me in 

 1880 ('80, ^; W. & G., '82, §1214; Mrs. Gage, '93, 283-284); 

 as its discoverer, I may be permitted to assign it a name. Pero 

 was proposed by me ('81, b) for the soft ectal layer of the 

 Bulbus olfactorius which, in hardened animal brains, often peels 

 off the firmer ental " core " like a boot; but the word is seldom 

 needed. If the tcnna (§194) pertains to two encephalic seg- 

 ments, diatcrina and pvsotenna seem to be both appropriate and in- 

 telligible. Mesocoele and diacoelc (Latin, inesocoelia and diacoclia; 

 English, mesocele and diacclc) have been discussed directly or 

 indirectly above (§201-203). Supraplexns, (introduced, I think 

 by Mrs. Gage ) would certainly be supposed to indicate a plexus 

 in the roof of some part of the brain cavity. Alba could 

 hardly suggest anything else than the substauita alba of the Ger- 

 man list ; see §116. 



§211. Aula. — After years of confusion, doubt, and even 

 distress of mind, induced by the failure to reconcile the facts of 

 development and comparative anatomy with the preval.ent 

 nomenclature of the brain, in 1880 ('80, d, c, f; '81, b, d) I 

 proposed aida upon grounds formulated two years later as fol- 

 lows (W. and G., '82, ^1065): — 



( I ) "To substitute brief single words for the phrases, "ventricu- 

 lus communis," " ventriculus lobi communis," mesal part of the 

 "common ventricular cavity," "foramen Monroi," etc. 



( 2 ) Because the phrase most commonly employed, foramen 

 Monroi, is used to designate at least three different cavities or orifices: 

 (a ) The cavity by which either paracoelia [" lateral ventricle"] com- 

 municates with the mesal series of cavities; {b) The two lateral ori- 

 fices together with the intervening space; {c) The mesal [cephalic] 

 orifice of the diacoelia. We have been unable to ascertain by whom 



