324 THE AMERICAN MONTHLY [Oct,, 



for more than forty years, and knew to be much older than that. 

 The contrast it presented to modern instruments, was the sub- 

 ject of no little comment by all. 



Among other exhibits, Prof. Seawell showed a section of the 

 eyes of Pecten. The next regular meeting will be held Octo. 

 ber 31st. 



MICROSCOPICAL NOTES. 



Microscopical Praxis. — This is the name of Dr. Stokes' new 

 book, just issued. It will be of much assistance to the novice 

 but he who would go extensively into such matters will take up 

 Carpenter or Gage after mastering the outlines here presented, 

 and some may be induced to do so by the pleasing introduc- 

 tion here acquired. 



Inoculation of Warts. — It has been found that warts may be 

 produced by inoculation. The microbes inoculated in the 

 epidermic layer multiply slowly, two months having elapsed 

 in some cases. Cultures of wart microbes on agar-agar give 

 greenish-yellow masses. With these cultures inoculation re- 

 sulted in 15 days in watery excrescences resembling warts. 

 There is no doubt that children with warts should be watched 

 carefully to prevent their contact with other children especially 

 at school. 



Primary Dissecting Microscope. — Manufactured by the 

 Bausch & Lomb Optical Co., Rochester, N. Y. This Micro- 

 scope was designed by Prof. C. R. Barnes of the University of 

 Wisconsin and has been in use in their and other laboratories 

 for several years with very satisfactory results. It is a most ef- 

 fective and low priced dissecting instiument. 



The body is a solid block of wood so shaped that the sides 

 serve as hand rests. The advantage of this is that the block 

 practically forms a part of the table on which it rests and is 

 then very steady to work upon. Mirror and movable glass 

 stage are provided for in a very simple manner. The lenses 

 are carried in an arm, the post of which slides in a metal 

 sleeve, thus allowing the entire stage to be covered and giving 

 sufficient rays and accuracy of focus. A square plate black on 

 one side and white on the other is arranged to slip under the 

 stage for dark or white ground. A grcwve on the lower side of 

 the block receives the plate when not in use. 



