60 MANUAL OF DETERMINATIVE BACTERIOLOGY 



author has failed to indicate the gender, the next subsequent author has 

 the right of choice. 



Section 15. Various Recommendations (Rec. XLV-L) 



XLV. When writing in modern languages botanists should use Latin scientific 

 names or those immediately derived from them, in preference to names of another 

 kind or origin (popular names). They should avoid the use of the latter unless these 

 are very clear and in common use. 



XLVII. Only the metric system should be used in botany for reckoning weights 

 and measures. The foot, inch, line, pound, ounce, etc., should be rigorously excluded 

 from scientific language. 



Altitude, depth, rapidity, etc., should be measured in meters. Fathoms, knots, 

 miles, etc., are terms which should disappear from scientific language. 



XLVIII. Very minute dimensions should be reckoned in y. (micromillimeters, 

 microns, or thousandths of a millimeter) and not in fractions of millimeters or of 

 lines, etc.: fractions encumbered with ciphers and commas easily give rise to mis- 

 takes. 



XLIX. Authors should indicate clearly and precisely the scale of the figures which 

 they publish. 



L. Temperatures should be expressed in degrees of the centigrade thermometer 

 of Celsius. 



Chapter IV. Interpretation and Modification of the Rules (Art. 73, 74) 



Art. 73. A small permanent International Executive Committee is established 

 with functions including the following: 



(1) Interpreting the Rules in doubtful cases, and issuing considered "Opinions" 



on the basis of the evidence submitted. 



(2) Considering Nomina conservanda, Nomina ambigua, Nomina dubia and 



Nomina confusa, and making recommendations thereon to the next Inter- 

 national Botanical Congress. 



(3) Considering all proposals for the modification of the Rules and reporting 



thereon to the next Congress. 



(4) Reporting on the effects of modifications of the Rules accepted at the pre- 



ceding Congress. 

 Art. 74. These Rules can be modified only by competent persons at an Interna- 

 tional Botanical Congress convened for the express purpose. Modifications accepted 

 at one Congress remain on trial until the next Congress, at which they will receive 

 sanction unless undesirable consequences, reported to the Executive Committee, 

 show need for further amendment or rejection. 



Eight appendices have been or are to be prepared for this Code as 

 follows: (1) fRegulations for determining types, (2) fNomina conservanda 

 familiarum, (3) *Nomina generica conservanda, (4) fNomina ambigua, 

 (5) fNomina dubia, (6) fNomina confusa, (7) *Representative botanical 

 institutions recognized under Art. 34, (8) fNomenclature of garden plants. 



Unfortunately the first appendix which is of greatest interest to bac- 

 teriologists has not been prepared. As many bacteriologists, especially 

 those in other countries, have not caught the significance of the type species 



* These appendixes have been prepared. 



t These appendixes have not been published as yet. 



