abstracts: botany 173 



characters, or (b) distinctly superior to them in some character or 

 quahty; and unless (r) it is to be placed in commercial culture. 



2. Priority. No two varieties of the same crop plant shall bear 

 the same name. The name first published (see Rule 4) for a variety 

 shall be the accepted and recognized name except in cases where it 

 has been applied in violation of this code. 



J. Form of names. The name of a variety shall consist of a single 

 word. 



4. Publication. A varietal name is established by publication. 

 Publication consists (i) in the distribution of a printed description of 

 the variety named, giving its distinguishing characters, or (2) in the 

 publication of a new name for a variety properly described elsewhere, 

 such publication to be made in any book, bulletin, circular, report, 

 trade catalog, or periodical, provided the same bears the date of issue 

 and is distributed generally among agronomists and crop growers; or 

 (3) in certain cases the general recognition of a name for a commercial 

 variety in a community for a number of years may be held to con- 

 stitute publication. 



Paragraphs i to 4 have numerous additional clauses not given here 

 which explain or interpret the rule. Paragraphs 5 and 6 deal with formal 

 citation and with changes, respectively. 



This code, essentially as presented, was officially adopted by the 

 American Society of Agronomy in November, 191 7. 



C. R. B. 



BOTANY. — Effects of various salts, acids, germicides, etc., upon the 

 infectivity of the virus causing the mosaic disease of tobacco. H. A. 

 Allard. Journ. Agr. Res. 13: 619-637. June 17, 1918. 



The virus of the mosaic disease of tobacco was treated for various 

 periods of time with difTerent concentrations of acids, salts, etc., to 

 determine their effect upon the infectivity. Nitric and hydrochloric 

 acids, except in concentrations approaching one gram in 50 to 100 cc. 

 of virus solution, affected the infectivity but little. Somewhat stronger 

 solutions of citric, phosphoric, and acetic acid were required to affect 

 the virus. Manganese sulphate, sodium chloride, aluminium sulphate, 

 lithium nitrate, sodium nitrate, lead nitrate, silver nitrate, and mercuric 

 chloride affected the virus but little under the conditions of the experi- 

 ments. Carbolic acid, creolin, cresol, and phenol affected the infective 

 principle only slightly under the conditions of the experiments, and 

 there was no appreciable difference in their relative effects. Acetone 



