130 BACTERIAL DISEASES OF PLANTS 



having none of the naturalist's outlook, and unable in my judg- 

 ment to do it alone. The trouble generally is that the artist 

 sees color rather than structure and strives for general effects 

 by omission of details, whereas the scientific man desires his 

 colors to be laid on carefully over definite structures. This is 

 not a criticism of the artist as such, but only of the artist turned 

 naturalist. The ends aimed at are different and each man is 

 right in his own field. 



To see examples of the various kinds of drawings and what 

 I mean by the above remarks, the student may consult "Bac- 

 teria in Relation to Plant Diseases," Vol. I, Figs. 1 (drawn from 

 a photomicrograph), 2 and 3 (drawn directly from the micro- 

 scope), 4 (drawn from a photomicrograph and reduced), 39, 

 63, 64, and 86 (good line drawings), 132 (rough but effective line 

 drawing) . 



Ibid., Vol. II, Figs. 4 (drawn unstained), 12, 15, 16, 17 (drawn 

 from stained sections directly from the microscope), 69 (drawn 

 directly from the microscope), 80 (a good wash-drawing re- 

 duced too much, compare with photomicrograph of same sub- 

 ject in this book, Fig. 72), 102 (inked over an enlargement from 

 a photomicrograph), 118 (inked over a photomicrograph and 

 then much reduced), 137 (drawn directly from the microscope). 



Ibid., Vol. Ill, Figs. 7 (drawn from a stained slide), 16 (drawn 

 from a broken negative), 19, 20, and 21 (drawn large from 

 stained slides and much reduced contrast 20 and 21 for 

 different methods of shading), 72 and 75 (drawn directly from 

 stained slides), 84 (drawn from the slide and much reduced), 

 86 (drawn from a photomicrograph), 105 (wash-drawing much 

 reduced), 108 (drawn from the slide but slightly diagrammatic). 



CARD CATALOGUES AND SYSTEMS OF FILING 



Every successful student of the natural sciences must of 

 necessity read widely and, since memory in civilized man is an 

 uncertain way of retaining knowledge, records of some sort are 

 absolutely necessary. Loose sheets or a pocket notebook serve 

 the ordinary man, but as knowledge widens, as many subjects 

 come under observation, and as scientific materials accumulate, 

 orderly catalogues and systems of filing become indispensable. 



