19.23] Proceedings of the Academy of Science 17 



Howe and others have shown that scorbutic diets also have marked 

 deleterious effects on the teeth and associated tissues. 



Both of these investigators call attention to the similarity between 

 these artificially produced dental defects and caries and pyorrhea in 

 man. 



The necessity of applying the newer knowledge of nutrition for the 

 prevention of dental caries was pointed out. This is especially im- 

 portant in the early years of the child. 



The Copperhead Snake at Raleigh, N. C. C. 8. Brimley. 



Not uncommon, 61 specimens being on record from 1885 to 1922 ; 

 four human beings and one dog have been known to be bitten by it, 

 all of whom recovered ; both in nature and in capitivity seems to be a 

 comparativel}^ good tempered snake. Short notes on diet and re- 

 production. 



Will be published in full in Copeia. 



A Simple M icroph otog ra phic Apparatus. J. B. Bullitt. 



Good photomicrographs may be made with a simple home-made 

 apparatus. An ordinary microscope, with its tube tilted to the hori- 

 zontal position, is set at about the middle of a thirty-inch plank. At 

 each end of the plank a plain wooden box is placed. On the proximal 

 surfaces of the boxes a hole is bored in each, in alignment with the 

 microscope tube. One end of a cloth sleeve is tacked to the face of 

 box No. 1, encircling the hole. The other end covers the microscope 

 ocular. A draw string makes this a light proof connection. The 

 microscope mirror is removed and secured upon a small stand in box 

 No. 2, where its concave surface reflects the light from an incandescent 

 lamp through the hole in the Avail of this box and into the Abbe con- 

 denser. This projects the image of the microscopical preparation upon 

 a screen at the back of box No. 1. The image is seen through a win- 

 dow in the top of the box. The screen is made by pasting a piece of 

 Avhite paper upon an old photographic plate and inserting this in the 

 usual plate holder. The plate holder fits snugly through a slot cut in 

 the back part of the top of the box. After focusing the projected 

 image, the light is cut off, a small piece of board is laid over the win- 

 dow in the box top and a photograpliic plate is substituted for the 

 screen. The exposure is now made by turning on the light. The whole 

 apparatus can be made at a cost of less than five dollars. It is not 



