. Dissection of the dog as a basis for the study of physiology . him tolearn some things from experience. To students withsome little experience in the art of dissection, or work-ing under the guidance of an instructor, it is a hin-drance rather than an advantage to attempt to describejust the direction and extent of each cut, the way in 8 PREFACE. which the instruments should be held, etc., or to pointout all the numerous possible mistakes which may bemade. It is better to leave something to the intelli-gence and discretion of the teacher or the pupil, if thedissecting is to prove a healthy d
. Dissection of the dog as a basis for the study of physiology . him tolearn some things from experience. To students withsome little experience in the art of dissection, or work-ing under the guidance of an instructor, it is a hin-drance rather than an advantage to attempt to describejust the direction and extent of each cut, the way in 8 PREFACE. which the instruments should be held, etc., or to pointout all the numerous possible mistakes which may bemade. It is better to leave something to the intelli-gence and discretion of the teacher or the pupil, if thedissecting is to prove a healthy discipline. It is but proper to say that the general idea of thearrangement of the directions for dissection was takenfrom the very excellent book on Practical Zoologyby Marshall and Hurst. I take pleasure also in expressing my thanks to myfriend Mr. T. D. Coleman, Assistant in Physiology inthis laboratory, for his kindness in helping me in thedissections and in the preparation of the diagrams. W. H. Howell. Johns Hopkins University,Baltimore, Md. The following brief description of methods andinstruments may contain some useful practical hintsfor those whose experience in such matters is limited. Method of Killing and Preparing the Dog.—Thequickest and most merciful method of killing the dogis to chloroform him. For this purpose it is onlynecessary to have a tight box or metal can with awell-fitting cover. In the bottom of this box placea sponge saturated with chloroform, put in the dogand close the lid. After a short time the animalbecomes quiet, but it should not be removed from thebox until all respiratory movements have ceased. Forconvenience in dissectinor the doQf should then betied down upon some form of dog-holder. Perhapsthe simplest and most economical form, one whichcan be readily made and answers -every purpose, isshown in I, Fig. i. It consists of a board about 30inches long and 12 inches wide, supported upon twoblocks, and having at one end a piece
Size: 1605px × 1556px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpubli, booksubjectdissection
