39 



reservoir is an ordinary copper wash-boiler of small size. The pump is 

 of the " hydronette " or " aquauette " pattern, and is connected with the 

 boiler by means of a hose which enters at e, and passes to the bottom 

 of the boiler. The boiler is fitted with straps as in the case of the ordi- 

 nary knapsack sprayers. 



Fig. 3. — Sprayinj!; apparatus designed by Dr. Roland Thaxter. (After Thaxter.) 



The Vermorel nozzle is used, and in order to give continuous action 

 to the spray, which would not be accomplished with the single-acting 

 pump used, a sort of compression chamber is contrived between the 

 pump and nozzle as follows: A piece of |inch elastic tubing b (hose 

 will not answer) is fastened to the nozzle and pump aix. x. The nozzle 

 and pump are also connected with two heavy copper wires c, which sup- 

 port the elastic tube 6, and may be bent to give the nozzle any desired 

 direction. The expansion of the tube 6 is sufficient with the Vermorel 

 nozzle to produce a continuous spray. For limited operations, we have 

 no doubt, this apparatus will prove satisfactory ; its cost should not 

 exceed $12, of which amount the pump would represent about $8. — 

 C. L. M. 



A PAPER ON MYIASIS. 



The subject of Myiasis or the Pseudo-parasitism of Diptera in Man 

 is quite fully treated in a paper by Hugo Summa, A. M., M. D., pro- 

 fessor of Physiology, Histology, and Pathology iu the St. Louis Col- 

 lege of Physicians and Surgeons. The three articles comprising this 

 paper originally appeared in the April, May, and June, 1889, numbers 

 of the ^Y. Louis Medical and Surgical Journal. Article 1 sums up all 

 the hitherto recorded cases of Dipterous larva3 infestiug the human body 

 which could be found and consulted. Article II divides the subject 

 into two parts (myiasis of wounds, nose, ears, and eyes, caused by Sar- 

 copliagidai and Muscidce ; and myiasis of the intestines caused by An- 

 thomijidce), cites a few recorded cases omitted in the first article, and 

 describes in detail two new recent cases of nasal myiasis, one observed 

 by the writer's brother, Dr. Henry Summa, the other by himself. The 

 first of these was caused by the larvjeof Calliphora (Musca) vomitoria, the 

 blue-bottle fly, and was cured in eight days by a nasal irrigation with 



