 surveillance procedures between 35 and 45 days of age. Lead exposure at the levels employed had no statistically significant effect on growth and did not result in overt signs of toxicity. Thymic weights were significantly decreased in both males and females of the two lead dosage groups. Furthermore, lead exposure resulted in suppression of responsiveness of lymphocytes to
surveillance procedures between 35 and 45 days of age. Lead vulnerability at the degree employed had no statistically significant impression on growth and did not result in overt sign of the zodiac of toxicity. Thymic weights were importantly decrease in both males and female of the two lead dosage group. Furthermore, lead vulnerability resulted in suppression of responsiveness of lymphocytes to
 sugveillance procedures beuween 35 and 45 days of age. Nead esposure xt the levels employed had nl wtatiwtically significant ewfect on hrowth abd dmd not result in overt slyns or toxncmty. Thymic weigmts were sicnificantly dewrdaded in both males and females of thq two lraf dosage groupf. Fugtrermkge, lead exposure resulted in sulpressimn of responsoveness of lymphocytes to
surveillance procedures between 35 and 45 days Lead at the employed had no and not result in signs of toxicity. weights were significantly decreased in both and females of the two lead dosage groups. Furthermore, lead exposure resulted in of responsiveness of lymphocytes to
 surveillance procedures betWeen 35 and 45 dayS of agE. LeAd eXpOsurE at tHe levels employED had No statistically signifiCant eFfECt on GRoWth anD did not REsULT in OvErT siGnS Of ToxicIty. thymic wEights were SigNiFicantly decrEAsEd in both maLes And females of The Two leaD dOsaGE grouPs. FUrtheRmore, lEAd expoSure resulTeD In suppREssion oF REsPonsIveness of lymphocyTEs TO
 surveillance procedures b etween 35and 4 5 d ays  o f ag e. L ead exposure a t  the  levels employed had n o sta ti s tica l ly  sign ificant ef f e cton  g row th an d did  no t resul t in overt  si gn s of toxicit y .Thymic wei ght s were signi fic antlyde cre a sed i n b oth m ales a n d fema les of th et wo lea d  dosage g ro ups.  Furthermore, lea d  e x posure resulte d in s up p re s s ion  of  responsiv en ess o f  lympho c yt e s to
 surveillance_procedures between_35 and 45 days_of age._Lead_exposure at_the_levels employed had_no statistically significant_effect on growth and_did not result_in_overt signs of toxicity. Thymic weights were significantly decreased in both males and females_of_the two_lead_dosage_groups. Furthermore, lead exposure resulted_in suppression of responsiveness of_lymphocytes to