The American journal of anatomy . 39 mm.; nos. 2 and 5 at 84 mm.; , 23 and 4 at 107 mm.; nos. 3, 18 and 1 at 130 mm.; and , 11 and 48 at 157 mm. The resulting curves are not essen-tially different from those in which all the litters were usedindividually, and the simplification due to the elimination ofoccasional irregularities is an advantage, particularly when sev-eral curves are combined in the same figure. The dotted portion of the line at the right indicates the trendof postnatal relative growth, from birth to maturity. It must,of course, be borne in mind that these curves giv
The American journal of anatomy . 39 mm.; nos. 2 and 5 at 84 mm.; , 23 and 4 at 107 mm.; nos. 3, 18 and 1 at 130 mm.; and , 11 and 48 at 157 mm. The resulting curves are not essen-tially different from those in which all the litters were usedindividually, and the simplification due to the elimination ofoccasional irregularities is an advantage, particularly when sev-eral curves are combined in the same figure. The dotted portion of the line at the right indicates the trendof postnatal relative growth, from birth to maturity. It must,of course, be borne in mind that these curves give an idea only ofthe general changes in the relative size of the various organs, andno information concerning the age, or the rapidity with which thechanges occur. 116 LAWSON G. LOWREY Fig. 1 contains four curves—one each for the head, Hver, andbrain, and one for all the viscera taken together. Fig. 2 contains five curves—one each for the kidneys, Wolffianbodies, heart, stomach and intestines with contents, and the 1516 25 39 58 84 107 130 157 Body Length in Millimeters 191 215 242 262 Vig,. 1 Curves showing the relative growth of all the viscera, the head, liverand brain. These curves were secured by arranging the average percentage(for the litter) which the organs form of the net body weight, according to theaverage body length (in millimeters). In certain cases, several litters are com-bined, the average of the litter averages being taken (see above). The brokenline at the right shows the trend of the post-natal relations, as indicated by theobservations on the adults. The information thus gained is only general, asthere are no indications concerning the age of the specimens, or the rnpidihjwith which the changes take place. Fig. 3 contains three curves—one each for the lungs, spinalcord, and eyeballs. Fig. 4 includes curves for the gonads (ovaries and testes), thy-mus and spleen. Fig. 5 includes curves for the suprarenal glands, thyroidand pancreas. PRENAT
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
