662 BURGESS AND KELLBERG: ALLOTROPY OF COPPER 



is reproduced in figure 3 in the form of a copper vs. platinum 

 resistance curve and also as a curve of residuals. The plot of 

 residuals was constructed from the platinum-copper resistance 

 curve, using a straight line as reference on cross section paper 

 165 X 140 cm. The residual plot is slightly curved on account 

 of the slightly different resistance-temperature relations of plati- 

 num and copper. 



We may, therefore, conclude that an allotropic transformation 

 of copper at about 70°C., postulated by Messrs. Cohen and 

 Hulderman, does not exist; that the resistance of copper in the 

 range of 0° to 100° varies continuously; and that ordinary copper 

 is most probably not in a metastable state. 



It may not, perhaps, be out of place to remark in conclusion, 

 that it is extremely regrettable that such a far reaching and dis- 

 quieting announcement as the metastability at ordinary tem- 

 peratures of a metal so widely used and extremely important in 

 exact measurements, should be made on the basis of two or three 

 series of very inconclusive measurements. 



MEDICAL ZOOLOGY. — Identification of the stages in the asexual 

 cycle of Bartonella bacilliformis, the pathogenic organism of 

 verruga, and their hearing on the etiology and unity of the 

 disease. Charles H. T. Townsend, Bureau of Ento- 

 mology. 



The etiology of the Peruvian disease known as verruga has 

 thus far remained obscure. The writer considers that he has 

 conclusively demonstrated Phlehotomus verrucarum Townsend as 

 the vector of this disease, but the true status of the specific 

 organism concerned is as yet undemonstrated. Barton described 

 as ''x-bodies" the mature gamete stage of this organism in 1909, 

 discovered by him in 1905 in the erythrocytes of the peripheral 

 blood of verruga cases in the fever phase. ^ Strong et al. have 

 redescribed the same stage under the name Bartonella hacilli- 

 formis,^ which they consider to be the specific organism of 



iCr6nica MMica (Lima) 26:7. 1909. 



2 Journ. Am. Med. Assoc. 61: 1713-1716. 1913; Rep. First Exped. So. Amer., 

 Harv. Sch. Trop. Med., 32. 1915. 



