 ... absent. The brown rat is more prolific than either the roof rat or the black rat. The female brown rat has usually 12 mammae — 3 pairs of pectoral and 3 pairs of inguinal — although these numbers are not constant, one or more teats frequently...  Contributions from the Department of Anatomy - Sivu 214tekijä(t) University of Minnesota. Department of Anatomy - 1917Koko teos - Tietoja tästä kirjasta
 | 1907 - 760 sivua
...inguinal, although these numbers are by no means constant. The black rat and the roof rat have but 10 mammae — 2 pairs of pectoral and 3 pairs of inguinal, with but little tendeniy to vary. Records of actual observations confirm the deductions to be drawn from the above... | |
 | 1910 - 296 sivua
...numbers are not constant, one or more teats frequently being undeveloped. The black rat and the roof rat have only 10 mammae — 2 pairs of pectoral and 3...of inguinal — with but little tendency to vary. Records of actual observations on the number of young confirm the deductions that might be drawn from... | |
 | 1910 - 282 sivua
...numbers are not constant, one or more teats frequently being undeveloped. The black rat and the roof rat have only 10 mammae — 2 pairs of pectoral and 3...of inguinal — with but little tendency to vary. Records of actual observations on the number of young confirm the deductions that might be drawn from... | |
 | 1917 - 534 sivua
...— although these numbers are not constant, one or more teats frequently being undeveloped. He al&o states that the black rat (Mus rattus) and the roof...reported in many other forms, including man. Therefore, hi all morphological and histological work as well as experimental work on the mammary gland, individual... | |
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