VI 



TISSUE RESPIRATION IN INVERTEBRATES 



also by the superscript "a." We have omitted 

 all reference to standard deviation and stand- 

 ard error. 



Within the table comprising Section 2 is a 

 column bearing the title "Remarks." It con- 

 tains miscellaneous information about the 

 salt solutions and inhibitors used, the methods 

 employed for determining nitrogen content, 

 the composition of various gas phases, and so 

 on. In this column we have noted, for example, 

 that during an assay cytochrome c was present 

 in the complete system, that P/O ratios ap- 

 pear in an original paper, or that specimens 

 used in a particular study were collected dur- 

 ing winter and spring. In other words, items 

 that we consider vital for proper evaluation of 

 the data appear in this column. 



There are many unfilled spaces in Section 

 2. The reader should clearly understand their 

 significance. The scientific name and common 

 name of an animal appear only once for each 

 work. Such usage is also true for temperature, 

 providing there is no change in this factor 

 during a given study, and also for apparatus, 

 when only one type is used throughout the study. 

 The author or authors and the date of publica- 

 tion are given once for each work. Thus, an 

 unfilled space in the first, second, third, and 

 last columns signifies that the same animal 

 was used by the same author at the same 

 temperature and with the same apparatus as 

 previously noted. 



Quite a different meaning should be read 

 into an unfilled space in columns 4 through 15. 

 In these coluntms such a blank space usually 

 indicates that no information regarding the 

 point in question appears in the original 

 paper. In a few instances, however, an un- 

 filled space in columns 4 through 15 relates 

 to data or descriptive material which, in our 

 opinion, is either unsuitable for inclusion or 

 of questionable interpretation. 



In Section 3 we have analyzed the data on 

 invertebrate tissue respiration, giving em- 

 phasis to principles and relationships that the 

 data illustrate. We have noted particularly the 

 effects of metabolic inhibitors and the influ- 

 ence of sex, age, composition of the suspending 

 medium, surgery, injury, and stage in the 

 molt cycle or life cycle on tissue respiration 

 in various invertebrates. In some instances 

 we have based our analysis in part upon in- 



formation contained within an original paper 

 but not included in Section 2. 



A discussion (Section 4) follows the analysis 

 of data. It is concerned not only with the mate- 

 rial presented in tabular form in Section 2 and 

 analyzed in the subsequent section but also with 

 broad principles and hypotheses suggested in the 

 various original papers. This discussion seeks 

 to examine selected data in terms of the light 

 that they may shed upon these principles and 

 hypotheses. 



A list of abbreviations and symbols used in 

 Section 2 appears in Section 5. Wherever pos- 

 sible, abbreviations are identical with those 

 given in Webster's New International Dictionary, 

 second edition, unabridged, 1958. 



Section 6 consists of the Glossary, which is 

 intended to give in a cursory way some under- 

 standing of the many technical terms used in 

 this work. For the most part, this glossary does 

 not include terms that appear in Webster's New 

 International Dictionary, second edition, un- 

 abridged, 1958. 



In Section 7 (Guide to Literature), we have 

 made suggestions for supplementary reading 

 on tissue metabolism and other pertinent fields. 

 Here we have listed books and articles that deal 

 with such topics as cell structure, electron 

 microscopy, intermediary metabolism, and man- 

 ometric methods, to name a few. Popular, semi- 

 popular, and semi -technical references bear an 

 asterisk. The complete citation for each book 

 and article appears in the Bibliography (Section 

 8). 



Section 9 consists of three indexes. In the 

 first, designated the Systematic Index, there is 

 a page reference for every mention of a given 

 animal in this volume. Insofar as we are aware, 

 the generic and specific names appearing in this 

 work are valid. Occasionally an author has used 

 an invalid name in an original paper. By use of 

 the Systematic Index, the reader can trace the 

 invalid name to the presently correct one. Also 

 indexed here are common names of animals 

 cited in the present work. 



In the Author Index, there is a reference for 

 every citation in this volume (exclusive of the 

 Bibliography). 



The third and last index deals with the vari- 

 ous subjects of which there is mention in this 

 work. 



No paper on invertebrate tissue respiration 



