vi Preface 



Thus this is a compendium in the older sense of that word 

 fcon and pendere, weighing together), rather than a digest. 

 Perhaps condensation may be in order later when more 

 animals have been managed successfully and more expe- 

 rience has accumulated. This is only a beginning. The gaps 

 in our knowledge are numerous and very obvious. Com- 

 paratively few invertebrate animals have been tried as yet, 

 and very few have been managed with complete success. 



These pages will record the experience of those among us 

 who have had some measure of success in rearing various 

 invertebrate animals, and will give the methods they have 

 found most useful. It is to be expected that these methods 

 may be improved by further trial. That economic values and 

 gains to health and comfort will grow out of further work 

 along these lines is altogether probable, for the scientific use 

 of our animal resources has only just begun. 



Some very simple procedures are included. We have not 

 forgotten the needs of the high school teacher who is wise 

 enough and diligent enough to teach zoology with the saving 

 grace and with the quickening thrill that comes from the use 

 of living materials. 



The Committee wishes to acknowledge the efficient aid 



of its secretary, Miss Mary E. Davis, who has carried a 



very large share of the burden of this compilation. The task 



has been lightened by receipt of many valuable voluntary 



contributions, and the response from those to whom we have 



appealed for culture methods has been both prompt and 



generous. 



Paul S. Galtsoff 



Frank E. Lutz 



Paul S. Welch 



James G. Needham, Chairman 



