Proceedings of Learned Societies. 225 



Salleron's Injector of Solids, which is capable of rendering this 

 action visible by means of solid bodies, consists of two air vessels, 

 with a communicating tube capable of being opened or closed at the 

 will of the experimenter. One of these vessels is made of glass, 

 and furnished with an aperture closed by a valve opening inwards. 

 The other has a small air-gun proceeding from it, the barrel of 

 which is directed against the opening in the first vessel. On con- 

 densing air into the two receivers, it is found that, even when four 

 atmospheres are condensed into the glass vessel, and only two in 

 that connected with the air-gun, the bullet driven by the latter 

 has power to open the valve closed by the pressure of four atmo- 

 spheres and enter the glass receiver. 



The paper read by Dr. Embleton on the Anatomy of a Chim- 

 panzee strongly corroborated the facts brought forward by Professor 

 Huxley and Mr. Marshall, that the brain of this animal differs only 

 in degree — that is, in the smaller size and extent of its parts — from 

 that of man ; and that with this difference essentially the same 

 structures, without any exception, exist in both brains. 



Dr. Crawford maintained in a subsequent paper that the con- 

 sideration of the material structure of the brain was of far less 

 value than a consideration of its working or living action, and 

 that probably there exist subtle differences between the brain of 

 man and those of the lower animals that anatomy has not, and 

 probably never will, detect. 



Thus the brain of the wolf is anatomically the same as that of 

 the dog, one being an untamable glutton, the other the friend and 

 companion of man. The Australian savages tame the young of the 

 wild-dogs, and use them in the chase, whereas the young of the 

 wolf are not capable of complete or useful domestication. Again, 

 the hog, with its low organized brain, is equal in intelligence to the 

 most anthropoid monkey. The sheep and the goat have brains 

 identical in structure, the one being a stupid, the other an intelli- 

 gent animal. 



Among the more singular new instruments exhibited at the 

 meeting must be mentioned M. Soleil's Tenebroscope, for demon- 

 strating the invisibility of light ; this was shown and described by 

 the Abbe Moigno. It illustrates the fact well-known to scientific 

 observers that rays of light are invisible except the eye is so situated 

 as to receive them either directly or as reflected from surrounding 

 objects. 



This is decisively shown when a beam of sunlight is admitted 

 into an otherwise perfectly dark chamber, and received on a piece 

 of black velvet or other non-reflective surface ; when the whole 

 chamber remains in perfect darkness, and the ray of light itself is 

 perfectly invisible except that small portion of it which is reflected 

 from the atoms of dust floating in the air. On powdering some 

 small dust in the course of the beam, or by pouring a shower of 

 water across it from a small watering can, it becomes immediately 

 visible ; and the chamber itself may be instantly illuminated by 

 receiving the beam on any reflective surface. M. Soleil's Tenebro- 

 scope consists of a tube closed at one end, the other being open to 



