3 & ‘_ sERMy (continued) that one might retain about 5%, retain in the skeleton about 5% what it inhales, and I get an inhslation hazard representing deposition in the skeleton of sbout the seme order of magnitude as I obtained by making assumptions somewhat similar to those whioh have just been discussed from the point of view of indigestion, I have a factor of difference of 5, I believe theese assusptions up here assum only exchangeable calcium don't they? Yan't that right, didn't you use a figura for exchangeable caloium up here? VOICE: Yes. WESTERN: And the figure I had was to correspond more to the total amoumt of caleium so on that basis the inhalation hasard is roughly about 1/5 of that indicated here. We are talicing about the same type of hasard so that the question of what is tolerance does not enter in. I might indicate also that if one begins to ecnsider the inhalation hasard as being relatively nonimportant, as one might if he finds a certain number of processes take place, preventing the stuff from being picked up by plants. Experiments of Dr. Larsen show that in time there is an unexpected cessation of uptake so that the inhalation hazard might become relatively important. Then one also aight want to consider the hazard due to Sx9?, It is commonly assumed that what is inhaled ia in eufficiently emall particle to he soluble and geta to the blood steam and is deposited in the bene, Ye don't have the factor of safety here/that wa have whon we talk about it coming to the bedy through the focd i wijere ve SRE ARCHIVES