The Journal of experimental zoology . ol larva at metamor-phosis. Oocytes, 50 n (smaller oocytes than those of 1917 larvae of same size). 98 Thyroidless larva (1918) (5 weeks old). Much younger than that offigure 97, but of much larger size, oocytes (60 n) are relatively of the same size. 99 Thyroidless larva one-half the size of larva of figure 98, but more thantwice as old (eleven weeks) Oocytes (130 /i) are relatively about four times aslarge in diameter as those in figure 98. 100 Thyroidless larva (1918). Very little older than larva of figure 99 (twelveweeks), but nearly four times as lar
The Journal of experimental zoology . ol larva at metamor-phosis. Oocytes, 50 n (smaller oocytes than those of 1917 larvae of same size). 98 Thyroidless larva (1918) (5 weeks old). Much younger than that offigure 97, but of much larger size, oocytes (60 n) are relatively of the same size. 99 Thyroidless larva one-half the size of larva of figure 98, but more thantwice as old (eleven weeks) Oocytes (130 /i) are relatively about four times aslarge in diameter as those in figure 98. 100 Thyroidless larva (1918). Very little older than larva of figure 99 (twelveweeks), but nearly four times as large. Oocytes (180 /x) are relatively smallerthan those of figure 99. 101 Thyroidless larva (6 months old), killed in October, 1917. Oocytes,200 M. 102 Thyroidless larva killed December 21, 1917 (eight months old). Oocytes,250 m. 103 Thyroidless larva fifteen months after thyroidectomy. Oocytes, 300 rejiresent the diameter of the largest oocytes. 66 GROWTH OF AMPHIBIA AFTER THYROIDECTOMY E. H. HOSKINS AXD M. M. 100 67 PLATE 9 EXPLANATION OF FIGURES R. sylvatica. Testes 104 A, T. S. Control larva at beginning of metamorphosis (July 29, 1917).X 34. B, same, showing beginning of tubule formation, but no synapsis. X 240. 105 A, T. S. Young control frog. X 34. B, same. X 240. 106 A, T. S. Thyroidless larva larger but of same age as larva of figure104. X 34. B, same, showing advance in tubule formation, but no 240. 107 A, T. S. Large thyroidless larva, killed four months after thyroidectomy(August 20, 1917). X 34. B, same, spermatogenesis begun. X 240. 108 A, T. S. Large thyroidless larva, six months after thyroidectomy. X , same, showing spermatozoa in tubules. X 240. 109 Large thyroidless larva one year older than that shown in figure fully matured testis. V. E., efferent tubule leading into kidney and con-taining spermatozoa. X 34. GROWTH OF AMPHIBIA AFTER THYROIDECTOMY E. R. HOSKINS AND M. M. HOSKINS
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1919
