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39. SMITH, E. W. A Contribution to the Life History of the Ponte- 



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40. LYON, FLORENCE M. A Contribution to the Life History of 



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41. STEVENS, W. C. The Behavior of the Kinoplasm and Nucleolus 



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42. CALDWELL, O. W. On the Life History of Lemna minor. Bot. 



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43. CAMPBELL, D. EL Notes on the Structure of the Embryo-sac in 



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44. FULLMER, E. L. The Development of the Microsporangia and Mi- 



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45. WIEGAND, K. M. The Development of the Microsporangium and 



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46. CANNON, W. A. A Morphological Study of the Flower and Em- 



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47. DUGGAR, B. M. Studies in the Development of the Pollen Grain in 



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48. MERRELL, W. D. A Contribution to the Life History of Silphium. 



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49. JOHNSON, D. S. On the Endosperm and Embryo of Peperomia 



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50. JUEL, H. O. Beitrage zur Kenntniss der Tetradenbildung. Jahrb. 



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51. LOTSY, J. P. Rhopalocnemis phalloides Jungh., a Morphological- 



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52. BYXBEE, EDITH. The Development of the Karyokinetic Spindle 



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53. THOMAS, ETHEL M. On the Presence of Vermiform Nuclei in a 



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54. STRASBURGER, E. Einige Bemerkungen zu der Pollenbildung 



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55. SCHAFFNER, J. H. A Contribution to the Life History and Cy- 



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