Agricultural Gazette of New South Wales Volume . 14

Agricultural Gazette of New South Wales Volume . 14

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...Introductory Note. By placing the following pages under the title "Letters" on the diseases of plants, I mean to indicate that they are made up of extracts from letters written in reply to requests for information on that subject or some special branch of it, or from notes made during investigations undertaken in response to such requests. For various reasons the whole of such notes may not have been transmitted in the letters, the principal reasons being the technical nature of the information and the fact that it could not be well conveyed without the aid of drawings, and these could not be prepared in Fig. 1.--Reference is often made in the following pages to t t-use of the magnifying elass. It is a very common thing to see this useful little instrument used in a fashion that does not aive the t-ect results--namely, held at a distance from the eye. The beat way to use such a li ns is shown in this illustration. The lens is first placed nar the eye, and the object to be viewed is brought into focus by placing the left hand against the right and pressing both against the cheek. This brings all three factors in the problem into harmonious connection--such that the line of sight can be readily adjusted and maintained, and what is equally important, the object can be brought very accurately into focus and held there steadily. This is by no means so small a matter as it may seem to those who do not realise how important an instrument a good pocket magnifier is. If every farmer carried, and frequently used, one of these instruments, it would result in the discovery of many pests in their early stages, when they might be easily put down. The incipient stages of many pests, while quite inviitible to thj uuaided eye, are easily visible under more

Product details

  • Paperback | 586 pages
  • 189 x 246 x 30mm | 1,034g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236580532
  • 9781236580535