160 AYEES AND JOHNSON: DESTRUCTION OF BACTERIA 



be supposed to revive the name under the binomial system, 

 should not affect the application of the name. 



The earliest binomial name applied to the sapote seems to have 

 been Jacquin's Sideroxylum sapota.^ The descriptive phrase 

 accompanying this name refers to the 'compound calyx or involu- 

 cre which is a peculiarity of the sapote, and there is also a citation 

 of Sloane's plate of "The Mammee Sapota tree" of Jamaica. 

 Jacquin's species was adopted by Linnaeus in the second edition 

 of the Species Plantarum, but Jacquin's specific name would have 

 become a homonym if transferred to the genus Achras and was 

 replaced by Achras mammosa Linnaeus.^ 



Neither Sideroxylum nor Lucuma is available as a generic 

 name for the sapote, both being based on species that are no longer 

 treated as congeneric with this tree. The name Vitellaria, bor- 

 rowed from Gaertner and applied to the sapote by Radlkofer, 

 has been rejected by later writers and remains a hyponym, not 

 having been associated with an identifiable generic type. Two 

 other generic names, Calospermum and Calocarpum, proposed 

 for the sapote by Pierre, prove to be homonyms. 



A new generic name Achradelpha is accordingly proposed, with 

 Achradelpha mammosa (Linnaeus) as the type species. 



A more extended statement of the case, with discussions of 

 some of the nomenclatorial principles involved, has been offered 

 for publication in Contributions from the U. S. National Herbar- 

 ium. 



BACTERIOLOGY. — The destruction of bacteria in milk by ultra- 

 violet rays.^ S. Henry Ayers, and W. T. Johnson, Jr. 

 Dairy Division, Bureau of Animal Industry. Communi- 

 cated by Karl F. Kellerman. 



During the past few years much attention has been given to 

 the bactericidal action of ultraviolet rays. Numerous investi- 

 gators have found that the ultraviolet rays of short wave length, 



^ Enumeratio pi. Ins. Carib. 1760. 

 2 Species Plantarum, 2 ed. 1: 469. 1762. 



^ The complete data obtained in this work will be published as a bulletin of the 

 Bureau of Animal Industry. 



