. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. UIQU SCHOOL ZOOLOGY. 283 atmoa- con- Lons of corres- ponding differences of atructui-e ; sucli are the asHociation of underground life with the absence of eyes and cl' colour (II, 71); III, 12) ; and that of the sha.\te of the body with the medium and mode of locomotion (Fig. 194). These offer a very tempt-. Vig. 194.—Harp Seal. Phooa (crcDnlandica (from Brehin). ing field for investigation, and cause us to enquire how changes in surrounding conditions and in habits affect animal life. 19, Reference has
. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. UIQU SCHOOL ZOOLOGY. 283 atmoa- con- Lons of corres- ponding differences of atructui-e ; sucli are the asHociation of underground life with the absence of eyes and cl' colour (II, 71); III, 12) ; and that of the sha.\te of the body with the medium and mode of locomotion (Fig. 194). These offer a very tempt-. Vig. 194.—Harp Seal. Phooa (crcDnlandica (from Brehin). ing field for investigation, and cause us to enquire how changes in surrounding conditions and in habits affect animal life. 19, Reference has already been made to the fact that organisms tend to increase in number in geomet»'ical progression. Some- times countless eggs are pi'oduced by single individual, but in such cases few of these reach maturity, and it is onl}' now and then that we are startled by the disproportionate development of some one species, disturbing the course of Nature. When, however, one generation exceeds the previous one, even in the proportion of two to one, it is evident that there will soon be a competition or struggle between the individuals for suitable food, and that the strongest and best adapted to survive will be those, on the whole, that do survive. Along with this we have to take into account the tendency of organisms to vary and to transmit their peculiarities to their descendants (§ 7). Those individuals whose organs vary in such a way as to adapt them better, however little, to their special circumstances of life, are, \. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wright, R. Ramsay (Robert Ramsay), 1852-1933. Toronto : Copp, Clark
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
