SECT, 2] 



AND WEIGHT 



501 



Table 68 [cont.). 

 Marcus' figures. Sea-urchin {Strongylocentrotus lividus). 



Days from 



fertilisation 



o 



7 

 22 



29-5 

 47-5 

 555 

 70-5 

 80 



95-5 

 118-5 



Temperature °C. 



Species 

 Minnow 

 Salmon 



Sea-urchin [Echinus esculentus) 

 Frog (Rana palustr is) 



,, (Rana vires cens) 

 Toad (Bufo lentiginosus) 

 Hen {Callus domesticus) 

 Salamander {Amblystoma 



tigrinus) 

 Frog {Rana fusca) ... 

 Hen [Callus domesticus) 



Green bug [Toxoptera gram- 



nium) 

 Texan cattle-fever tick [Mar- 



garopus annulatus) 

 Brown-tailed moth [Euproctis 



anysonhea) 

 Bombycid moth [Samia cecro- 



pia) 

 Mealworm [Tenebrio molitor) 

 Colorado potato-beetle [Lep- 



tinotarsa decemlineata) 

 Pine bug [Dendrolimus pini) 

 Hen [Callus domesticus) 

 Rhea [Rhea americana) 

 Locust [Melanoplus differen- 



tialis) 

 Locust [Melanoplus femur-ru- 



brum) 



* Atkinson considers that 

 heat is conveyed to the eggs 

 thin sheet of rubber. 



Mini- 

 mum Optimum 

 o — 



2-5 



3 



6 



25 

 o 



17-22 



30 

 32 

 38 



Maximum 

 12-15 

 12-15 



42 



o — 



28 35-39 



29 — 



20-5 — 



- 37-6 (ist week) 

 38-3 (2nd „ ) 



39-1 (3rd „ ) 

 1-65 — 



7-5 — 



II — 



11 — 



9 — 



12 — 



14 — 



- 38-3* 



- 38-5 

 18 36 



18 36 



43 



32 



32-5 

 28 



Investigator 

 Rauber 



>j 

 Vernon 

 Morgan 



Lillie & Knowlton 



Rauber 



Lillie & Knowlton 



Schultze 

 Kaestner 

 Prevost & Dumas 

 Edwards 

 Eccleshymer 



Hunter & Glenn 

 Hunter & Hooker 

 Sanderson 



Regener 



Phillips & Brooks 

 Rozanov 

 Bodine 



better results in artificial incubation are obtained when the 

 by conduction, not radiation, e.g. by covering them with a 



